:root {
  color-scheme: dark;
  --bg: #061519;
  --surface: #0b2227;
  --surface-2: #103038;
  --line: rgba(158, 244, 224, 0.16);
  --text: #f3fffc;
  --muted: #8fb2b4;
  --aqua: #39e6c2;
  --aqua-strong: #1dc6aa;
  --warning: #ffb44a;
  --danger: #ff7272;
  --radius: 22px;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 85% -10%, rgba(57, 230, 194, 0.2), transparent 34rem),
    radial-gradient(circle at -20% 30%, rgba(29, 198, 170, 0.12), transparent 26rem),
    var(--bg);
  color: var(--text);
}

button, input, select { font: inherit; }
.shell { width: min(100%, 850px); margin: 0 auto; padding: 24px 16px 48px; }

.hero { display: flex; gap: 15px; align-items: flex-start; margin: 8px 2px 24px; }
.brand-mark {
  flex: 0 0 52px; height: 52px; display: grid; place-items: center;
  border-radius: 16px; background: var(--aqua); color: #03251f;
  font-weight: 900; letter-spacing: -1px; box-shadow: 0 8px 30px rgba(57, 230, 194, .22);
}
.eyebrow { margin: 0 0 5px; color: var(--aqua); font-weight: 800; font-size: 11px; letter-spacing: .14em; }
h1, h2 { margin: 0; letter-spacing: -.025em; }
h1 { font-size: clamp(25px, 6vw, 38px); line-height: 1.05; }
h2 { font-size: 20px; }
.intro { margin: 10px 0 0; max-width: 620px; color: var(--muted); line-height: 1.45; }

form { display: grid; gap: 14px; }
.card, .result {
  background: linear-gradient(150deg, rgba(16, 48, 56, .96), rgba(8, 31, 36, .98));
  border: 1px solid var(--line); border-radius: var(--radius); padding: 18px;
  box-shadow: 0 18px 45px rgba(0, 0, 0, .22);
}
.section-heading { display: flex; gap: 12px; align-items: center; padding-bottom: 16px; border-bottom: 1px solid var(--line); }
.section-heading p { margin: 4px 0 0; color: var(--muted); font-size: 13px; }
.step {
  display: grid; place-items: center; width: 40px; height: 40px; border: 1px solid rgba(57, 230, 194, .35);
  border-radius: 13px; color: var(--aqua); font-size: 12px; font-weight: 800;
}

.dimensions-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; padding-top: 16px; }
.field { display: grid; gap: 7px; }
.field span, .setting-copy label { font-weight: 700; font-size: 14px; }
input, select {
  width: 100%; min-height: 48px; border-radius: 13px; border: 1px solid var(--line);
  background: rgba(3, 19, 22, .72); color: var(--text); padding: 0 13px; outline: none;
}
input:focus, select:focus { border-color: var(--aqua); box-shadow: 0 0 0 3px rgba(57, 230, 194, .11); }

.settings-list { display: grid; }
.setting-row {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(150px, 220px); gap: 14px; align-items: center;
  padding: 15px 0; border-bottom: 1px solid var(--line);
}
.setting-row:last-child { border-bottom: 0; padding-bottom: 0; }
.setting-copy { display: grid; gap: 5px; }
.recommendation { color: var(--aqua); font-size: 12px; line-height: 1.35; }
.custom-input { grid-column: 2; margin-top: -6px; }

.primary-button, .ghost-button {
  border: 0; cursor: pointer; transition: transform .14s ease, opacity .14s ease;
}
.primary-button:active, .ghost-button:active { transform: scale(.985); }
.primary-button {
  min-height: 58px; border-radius: 18px; padding: 0 20px; display: flex; justify-content: space-between; align-items: center;
  background: var(--aqua); color: #03251f; font-weight: 900; font-size: 16px;
  box-shadow: 0 12px 34px rgba(57, 230, 194, .2);
}
.primary-button:disabled { opacity: .55; cursor: wait; }
.ghost-button { background: transparent; color: var(--aqua); padding: 9px 0 9px 14px; font-weight: 800; }
.error-box { border: 1px solid rgba(255, 114, 114, .4); border-radius: 14px; color: #ffd4d4; background: rgba(120, 24, 24, .22); padding: 13px; }

.result { margin-top: 20px; }
.result-header { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 17px; }
.metric-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 9px; }
.metric { padding: 14px; background: rgba(3, 19, 22, .65); border: 1px solid var(--line); border-radius: 15px; }
.metric span { display: block; color: var(--muted); font-size: 12px; margin-bottom: 5px; }
.metric strong { font-size: 19px; }
.result-block { margin-top: 17px; }
.result-block h3 { font-size: 15px; margin: 0 0 9px; }
.comparison { display: grid; gap: 7px; }
.comparison-row { display: grid; grid-template-columns: 1.3fr 1fr 1fr; gap: 8px; padding: 10px 11px; border-radius: 12px; background: rgba(3, 19, 22, .5); font-size: 13px; }
.comparison-row.header { color: var(--muted); background: transparent; padding-top: 0; padding-bottom: 2px; font-size: 11px; }
.comparison-row strong { color: var(--aqua); }
.part { padding: 12px 0; border-bottom: 1px solid var(--line); }
.part:last-child { border-bottom: 0; }
.part-title { display: flex; justify-content: space-between; gap: 12px; font-weight: 800; }
.part p { margin: 5px 0 0; color: var(--muted); font-size: 12px; line-height: 1.4; }
.warning-list { margin: 0; padding-left: 20px; color: #ffd49a; }
.warning-list li { margin: 6px 0; }
.telegram-button { width: 100%; margin-top: 18px; justify-content: center; }
.disclaimer { color: var(--muted); font-size: 11px; line-height: 1.45; margin: 14px 0 0; }

@media (max-width: 580px) {
  .shell { padding: 16px 10px 34px; }
  .hero { margin-top: 2px; }
  .card, .result { padding: 15px; border-radius: 19px; }
  .dimensions-grid { grid-template-columns: 1fr; }
  .setting-row { grid-template-columns: 1fr; gap: 8px; }
  .custom-input { grid-column: 1; margin-top: 0; }
  .comparison-row { grid-template-columns: 1.2fr .85fr .85fr; font-size: 12px; }
}